diff --git a/PDP10/ka10_dpk.c b/PDP10/ka10_dpk.c
index 4f6b9201..d83994d9 100644
--- a/PDP10/ka10_dpk.c
+++ b/PDP10/ka10_dpk.c
@@ -112,7 +112,7 @@ DEVICE dpk_dev = {
     DPK_NAME, dpk_unit, NULL, dpk_mod,
     2, 8, 0, 1, 8, 36,
     NULL, NULL, dpk_reset, NULL, dpk_attach, dpk_detach,
-    &dpk_dib, DEV_DISABLE | DEV_DIS | DEV_DEBUG, 0, dev_debug,
+    &dpk_dib, DEV_DISABLE | DEV_DIS | DEV_DEBUG | DEV_MUX, 0, dev_debug,
     NULL, NULL, dpk_help, NULL, NULL, dpk_description
 };
 
diff --git a/PDP10/ka10_iii.c b/PDP10/ka10_iii.c
index 0c9cc1be..55776842 100644
--- a/PDP10/ka10_iii.c
+++ b/PDP10/ka10_iii.c
@@ -320,7 +320,7 @@ DEVICE iii_dev = {
     "III", iii_unit, NULL, iii_mod,
     2, 10, 31, 1, 8, 8,
     NULL, NULL, iii_reset,
-    NULL, NULL, NULL, &iii_dib, DEV_DEBUG | DEV_DISABLE | DEV_DIS, 0, dev_debug,
+    NULL, NULL, NULL, &iii_dib, DEV_DEBUG | DEV_DISABLE | DEV_DIS | DEV_DISPLAY, 0, dev_debug,
     NULL, NULL, &iii_help, NULL, NULL, &iii_description
     };
 
diff --git a/PDP10/ka10_mty.c b/PDP10/ka10_mty.c
index f47e4a9f..dce73314 100644
--- a/PDP10/ka10_mty.c
+++ b/PDP10/ka10_mty.c
@@ -94,7 +94,7 @@ DEVICE mty_dev = {
     MTY_NAME, mty_unit, NULL, mty_mod,
     2, 8, 0, 1, 8, 36,
     NULL, NULL, mty_reset, NULL, mty_attach, mty_detach,
-    &mty_dib, DEV_DISABLE | DEV_DIS | DEV_DEBUG, 0, dev_debug,
+    &mty_dib, DEV_DISABLE | DEV_DIS | DEV_DEBUG | DEV_MUX, 0, dev_debug,
     NULL, NULL, mty_help, NULL, NULL, mty_description
 };
 
diff --git a/PDP10/ka10_tk10.c b/PDP10/ka10_tk10.c
index 1ddfcd77..9815c29a 100644
--- a/PDP10/ka10_tk10.c
+++ b/PDP10/ka10_tk10.c
@@ -92,7 +92,7 @@ DEVICE tk10_dev = {
     TK10_NAME, tk10_unit, NULL, tk10_mod,
     1, 8, 0, 1, 8, 36,
     NULL, NULL, tk10_reset, NULL, tk10_attach, tk10_detach,
-    &tk10_dib, DEV_DISABLE | DEV_DIS | DEV_DEBUG, 0, dev_debug,
+    &tk10_dib, DEV_DISABLE | DEV_DIS | DEV_DEBUG | DEV_MUX, 0, dev_debug,
     NULL, NULL, tk10_help, NULL, NULL, tk10_description
 };
 
diff --git a/PDP10/kl10_fe.c b/PDP10/kl10_fe.c
index b2593963..39e0eba1 100644
--- a/PDP10/kl10_fe.c
+++ b/PDP10/kl10_fe.c
@@ -554,7 +554,7 @@ DEVICE tty_dev = {
     2, 10, 31, 1, 8, 8,
     &tmxr_ex, &tmxr_dep, &tty_reset,
     NULL, &tty_attach, &tty_detach,
-    NULL, DEV_NET | DEV_DISABLE | DEV_DEBUG, 0, dev_debug,
+    NULL, DEV_MUX | DEV_DISABLE | DEV_DEBUG, 0, dev_debug,
     NULL, NULL, &tty_help, NULL, NULL, &tty_description
     };
 #endif
diff --git a/PDP10/kl10_nia.c b/PDP10/kl10_nia.c
index a755703e..734649a6 100644
--- a/PDP10/kl10_nia.c
+++ b/PDP10/kl10_nia.c
@@ -419,7 +419,7 @@ DEVICE nia_dev = {
     "NI", nia_unit, nia_reg, nia_mod,
     3, 8, 0, 1, 8, 36,
     NULL, NULL, &nia_reset, NULL, &nia_attach, &nia_detach,
-    &nia_dib, DEV_DISABLE | DEV_DIS | DEV_DEBUG, 0, nia_debug,
+    &nia_dib, DEV_DISABLE | DEV_DIS | DEV_DEBUG | DEV_ETHER, 0, nia_debug,
     NULL, NULL, &nia_help, NULL, NULL, &nia_description
 };
 
diff --git a/PDP10/kx10_dc.c b/PDP10/kx10_dc.c
index 3adfe3db..8e652455 100644
--- a/PDP10/kx10_dc.c
+++ b/PDP10/kx10_dc.c
@@ -147,7 +147,7 @@ DEVICE dc_dev = {
     1, 10, 31, 1, 8, 8,
     &tmxr_ex, &tmxr_dep, &dc_reset,
     NULL, &dc_attach, &dc_detach,
-    &dc_dib, DEV_NET | DEV_DISABLE | DEV_DEBUG, 0, dev_debug,
+    &dc_dib, DEV_MUX | DEV_DISABLE | DEV_DEBUG, 0, dev_debug,
     NULL, NULL, &dc_help, NULL, NULL, &dc_description
     };
 
@@ -433,18 +433,18 @@ t_stat dc_setnl (UNIT *uptr, int32 val, CONST char *cptr, void *desc)
         return r;
     if (newln > dc_modem)
         return SCPE_ARG;
-    if ((newln == 0) || (newln >= DC10_MLINES) || (newln % 8) != 0)
+    if ((newln == 0) || (newln > DC10_MLINES) || (newln % 8) != 0)
         return SCPE_ARG;
     if (newln < dc_desc.lines) {
-        for (i = newln, t = 0; i < dc_desc.lines; i++)
+        for (i = newln - 1, t = 0; i < dc_desc.lines; i++)
             t = t | dc_ldsc[i].conn;
         if (t && !get_yn ("This will disconnect users; proceed [N]?", FALSE))
             return SCPE_OK;
-        for (i = newln; i < dc_desc.lines; i++) {
+        for (i = newln - 1; i < dc_desc.lines; i++) {
             if (dc_ldsc[i].conn) {
                 tmxr_linemsg (&dc_ldsc[i], "\r\nOperator disconnected line\r\n");
                 tmxr_send_buffered_data (&dc_ldsc[i]);
-                }
+            }
             tmxr_detach_ln (&dc_ldsc[i]);               /* completely reset line */
         }
     }
@@ -468,7 +468,7 @@ t_stat dc_set_log (UNIT *uptr, int32 val, CONST char *cptr, void *desc)
     if ((cptr == NULL) || (*cptr == 0) || (gbuf[0] == 0))
         return SCPE_ARG;
     ln = (int32) get_uint (gbuf, 10, dc_desc.lines, &r);
-    if ((r != SCPE_OK) || (ln >= dc_desc.lines))
+    if ((r != SCPE_OK) || (ln > dc_desc.lines))
         return SCPE_ARG;
     return tmxr_set_log (NULL, ln, cptr, desc);
 }
@@ -483,7 +483,7 @@ t_stat dc_set_nolog (UNIT *uptr, int32 val, CONST char *cptr, void *desc)
     if (cptr == NULL)
         return SCPE_ARG;
     ln = (int32) get_uint (cptr, 10, dc_desc.lines, &r);
-    if ((r != SCPE_OK) || (ln >= dc_desc.lines))
+    if ((r != SCPE_OK) || (ln > dc_desc.lines))
         return SCPE_ARG;
     return tmxr_set_nolog (NULL, ln, NULL, desc);
 }
diff --git a/PDP10/kx10_defs.h b/PDP10/kx10_defs.h
index 5c6e3978..5dbd7f07 100644
--- a/PDP10/kx10_defs.h
+++ b/PDP10/kx10_defs.h
@@ -606,7 +606,7 @@ extern void ka10_lights_clear_aux (int);
 #define NUM_DEVS_DP     0
 #define NUM_DEVS_LP20   1
 #define NUM_DEVS_TTY    1
-#define NUM_LINES_TTY   40
+#define NUM_LINES_TTY   64
 #define NUM_DEVS_NIA    1
 #else
 #define NUM_DEVS_RC     1
diff --git a/PDP10/kx10_dp.c b/PDP10/kx10_dp.c
index 40ac232f..cd13e4cb 100644
--- a/PDP10/kx10_dp.c
+++ b/PDP10/kx10_dp.c
@@ -423,6 +423,7 @@ t_stat dp_devio(uint32 dev, uint64 *data) {
              /* Stop controller */
              sim_cancel(uptr);
              df10_finish_op(df10, 0);
+             uptr->STATUS &= ~(BUSY);
          }
          /* Clear flags */
          uptr->STATUS &= ~(*data & CLRMSK);
diff --git a/PDP10/kx10_dpy.c b/PDP10/kx10_dpy.c
index a2111dc0..668cda4e 100644
--- a/PDP10/kx10_dpy.c
+++ b/PDP10/kx10_dpy.c
@@ -30,6 +30,29 @@
  * for PDP-6 described in
  * http://www.bitsavers.org/pdf/dec/graphics/H-340_Type_340_Precision_Incremental_CRT_System_Nov64.pdf
  *
+ * The MIT file .INFO.;340 INFO says:
+ *    ;CONI BITS OF THE 340 ARE:
+ *            ;2.9-2.7        MODE
+ *            ;2.4            VECT CONT LP(????)
+ *            ;2.3            VERTICAL EDGE HIT
+ *            ;2.2            LIGHT PEN HIT
+ *            ;2.1            HORIZONTAL EDGE HIT
+ *            ;1.9            STOP
+ *            ;1.8            DONE (CAUSES DATA INTERUPT)
+ *            ;1.6-1.4        SPECIAL PIA
+ *            ;1.3-1.1        DATA PIA
+ *    ;340 CONO BITS ARE:
+ *            ;2.3            CLEAR NO INK MODE
+ *            ;2.2            SET NO INK MODE (IN NO INK MODE, NO INTENSIFICATION CAN \
+ *     OCCUR)
+ *            ;2.1            CLEAR HALF WORD MODE
+ *            ;1.9            SET HALF WORD MODE
+ *            ;1.8            RESUME DISPLAY (TO CONTINUE AFTER A SPECIAL INTERUPT)
+ *            ;1.7            INTIALIZE
+ *            ;1.6-1.4        SPECIAL PIA
+ *            ;1.3-1.1        DATA PIA
+ * ITS uses the "resume display" bit, so it has been implemented here.
+ *
  * 340C was used in the PDP-10 VB10C display system
  * http://bitsavers.informatik.uni-stuttgart.de/pdf/dec/pdp10/periph/VB10C_Interactive_Graphics_Terminal_Jul70.pdf
  *      "The basic hardware system consists of a 340/C display connected
@@ -55,7 +78,7 @@
  *           7 PI channel?
  *   DISCON = CHAN + 140 (continue?)
  * *NO* DATAO or BLKO to device 130!
- *    
+ *
  * It appears that the reloc/protect mechanism is on I/O device 134.
  * (referred to by number, not symbol!)
  * DATAO sets reloc/protect, start addr
@@ -138,6 +161,7 @@ extern uint64 SW;        /* switch register */
 #define CONI_INT_HE     0001000         /* I- b26: HOR EDGE */
 #define CONI_INT_SI     0000400         /* I- b27: STOP INT */
 #define CONI_INT_DONE   0000200         /* I- b28: done with second half */
+#define CONO_RESUME     0000200         /* -O b28: resume after special int */
 #define CONO_INIT       0000100         /* -O b29: init display */
 #define CONX_SC         0000070         /* IO special channel */
 #define CONX_DC         0000007         /* IO data channel */
@@ -169,7 +193,7 @@ DEVICE dpy_dev = {
     NUM_DEVS_DPY, 0, 0, 0, 0, 0,
     NULL, NULL, dpy_reset,
     NULL, NULL, NULL,
-    &dpy_dib, DEV_DISABLE | DEV_DIS | DEV_DEBUG, 0, NULL,      
+    &dpy_dib, DEV_DISABLE | DEV_DIS | DEV_DEBUG | DEV_DISPLAY, 0, NULL,
     NULL, NULL, NULL, NULL, NULL, &dpy_description
     };
 
@@ -253,6 +277,13 @@ t_stat dpy_devio(uint32 dev, uint64 *data) {
         uptr->STAT_REG |= *data & CONO_MASK;
         if (*data & CONO_INIT)
             dpy_update_status( uptr, ty340_reset(&dpy_dev), 1);
+        if (*data & CONO_RESUME) {
+            /* This bit is not documented in "H-340 Type 340 Precision
+               Incremental CRT System".  It is in the MIT file .INFO.;
+               340 INFO, and ITS does depend on it. */
+            ty340_clear(CONI_INT_VE | CONI_INT_LP | CONI_INT_HE);
+            dpy_update_status( uptr, ty340_status(), 0);
+        }
         sim_debug(DEBUG_CONO, &dpy_dev, "DPY %03o CONO %06o PC=%06o %06o\n",
                   dev, (uint32)*data, PC, uptr->STAT_REG & ~STAT_VALID);
         if (!sim_is_active(uptr))
@@ -266,7 +297,7 @@ t_stat dpy_devio(uint32 dev, uint64 *data) {
         /* if fed using BLKO from interrupt vector, PC will be wrong! */
         sim_debug(DEBUG_DATAIO, &dpy_dev, "DPY %03o DATO %012llo PC=%06o\n",
                   dev, *data, PC);
-        
+
         inst = (uint32)LRZ(*data);
         if (dpy_update_status(uptr, ty340_instruction(inst), 0)) {
             /* still running */
diff --git a/PDP10/kx10_imp.c b/PDP10/kx10_imp.c
index 53323ed2..4ebd6c16 100644
--- a/PDP10/kx10_imp.c
+++ b/PDP10/kx10_imp.c
@@ -563,7 +563,7 @@ DEVICE imp_dev = {
     "IMP", imp_unit, imp_reg, imp_mod,
     3, 8, 0, 1, 8, 36,
     NULL, NULL, &imp_reset, NULL, &imp_attach, &imp_detach,
-    &imp_dib, DEV_DISABLE | DEV_DIS | DEV_DEBUG, 0, imp_debug,
+    &imp_dib, DEV_DISABLE | DEV_DIS | DEV_DEBUG | DEV_ETHER, 0, imp_debug,
     NULL, NULL, &imp_help, NULL, NULL, &imp_description
 };
 #define IMP_OCHN     0000007